---
title: "system.opchda.readAttributes"
description: "Reads the specified attributes for the given item over a time range."
---

# system.opchda.readAttributes

> Reads the specified attributes for the given item over a time range.

This function is used in **Python Scripting**.

## Description
Reads the specified attributes for the given item over a time range. Attributes and their IDs are defined in the OPC-HDA specification, and can be discovered by calling [system.opchda.getAttributes()](appendix\scripting-functions\system-opchda\system-opchda-getAttributes.md).

## Client Permission Restrictions
This scripting function has no [Client Permission](projects\project-properties\project-properties.md#client---permissions) restrictions.

## Syntax
`system.opchda.readAttributes(serverName, itemId, attributeIds, startDate, endDate)`

### Parameters

|Type|Parameter|Description|
|--|--|--|
|String |`serverName` | The name of the defined OPC-HDA server to read.|
|String |`itemId` | The itemID to retrieve attributes for.|
|String |`attributeIds` | The integer IDs of the attributes to read. The attribute ids are defined in the OPC-HDA specification. The attributes can also be obtained by calling system.opchda.getAttributes(). Some servers may not support all attributes.|
|String| `startDate` | The starting date/time of the query.|
|String |`endDate` | The ending date/time of the query.|
### Returns
**ReadResults[]** - A list of read results which is one-to-one with the requested attributes. The ReadResult object has a `serviceResult` quality property that indicates whether the call was successful, and is itself a list of QualifiedValues.
### Scope
All